A loss to Gennady Golovkin has not dented Kell Brook's confidence and he plans to rule boxing's light-middleweight division.
Sheffield fighter Brook earned plenty of credit for stepping up two divisions to fight Gennady Golovkin in a world middleweight clash at London's O2 Arena on Saturday.
The Kazakh, widely considered boxing's pound-for-pound king, remained undefeated in a brutal bout in which Brook sustained a broken eye socket, forcing his corner to throw in the towel and hand him his first professional defeat.
Brook, the IBF welterweight world champion, believes that he has shown his ability to mix it with the best despite the loss, but concedes his best division may be light middleweight.
"I think it was so easy making middleweight, I filled out to the weight, but I believe my strength will be at light-middleweight - I think I'm unstoppable at that weight," he told Sky Sports News.
"I'm looking at the Canelo-Smith fight next week, I would love the winner. I've got a big heart, I want to get in with the big punchers, 154 [lbs] is my weight.
"I put a lot of pressure on myself. I really did think I could win the fight, a lot of people have seen I have got big cojones to move up there with the most feared man and have a stand-off with him.
"I've got the eye of the tiger, I mean business, I belong at that level."
Trainer Dominic Ingle's decision to call an end to the fight initially drew a negative reaction from the crowd, but Brook concedes it was the right call.
He added: "Everybody has their own decision to make. I came back after the second round and said 'I can't see out of my right eye Dominic'.
"He knows me, he's seen me grow up and he's like a father figure to me. If people look back it was the right decision.
"I can fight for another day, he knew I was getting caught on it [his injured eye] and it could get bad."